I believe he is talking about STL M17/M18 (Flight of the Arrow and I forget the other's ingame name
). In those missions you have to chase Grikaths, AM missiles on the way to the Moon's shipyards and in the 2nd chase AM missiles heading towards the cities of the northern hemisphere and S-90 missiles that are trying to fry the Earth.
The mission you mention is STL M14 "Too Much Company" when you can potentially have 3 Targus and a Ralatha attacking the Firekka. Although I'm guessing most people killed the first Targu in the Search & Rescue mission since Quarto missed a bug that forced the player to fly the Stiletto instead of the Rapier on the first Ep5 losing path mission
But if you don't kill it, it makes the mission even more intense.